Device for sharpening gramophone needles



March-2 9, 1932, A, wRlGHT 1,851,229

DEVICE FOR SHARPENING GRAMOPHONE NEEDLES Filed Oct. 25. 1930 W I gvi/yrm I Array/v5 abr'asivewhich would give best results. The

sharpener is, however, particularly suitable for the sharpening of soft needles as for instance Burmese colour needles and fibre needles which are worth while re-grinding in view of their reater cost relatively to the more usual stee needles.

The chuck 2 may, of course, be made in tegral with the member 3, but it is preferred,

as is shown in the drawings, to make it a separate element, so as to enable a'number of chucks of sizes appropriate to different types 7 of needles to be fitted. These chucks may very conveniently be of the type described in British patent application No. 22,47 6/30, which are so made that they will fit both the tubular member 3 and the gramophone sound box I claim: I

1. An abrasive device for pointing small cylindrical objects comprising incombination a supporting frame, an abrasive disc rotatably mounted in said supporting frame, a

" crank handle also rotatably mounted in said supporting frame, a pillar extending laterally from said supporting frame, a rod pivotally fixed to said pillar, a tubular carrier for the object to be pointed rotatably mounted on said rod, gearing mounted in said supporting frame and connecting said crank handle to said abrasive disc and to said carrier, resilient means acting on said rod to ensure engagement of said carrier and said gearing and means for yieldingly urging said abrasive disc and the object to be pointed into contact with each other.

2. An abrasive device for pointing small cylindrical objects comprising in combination a supporting frame, an abrasive disc rotatably mounted in said supporting frame, a crank handle also rotatably mounted in said supporting frame, a pillar extending laterally from said supporting frame, a rod pivotally fixed to said pillar, a tubular carrier for the object to be pointed rotatably mounted on said rod and having a disc shaped enlargement at an intermediate point in its length, gearing mounted in said supporting frame and connecting. said crank handle to" said abrasive disc, gearing also connecting said crank handle and said carrier, resilient means for engaging said enlargement and said gearing'and means for yieldingly urging said abrasive disc and the object to be pointed into contact with each other.

3. An abrasive device for pointing small cylindrical objects comprising in combina- 5 t on a. supporting frame, a rotatable spindle mounted with axial pla in said supporting frame, a toothed wheel fixed to said spindle an abrasive wheel removably fixed to said spindle, a second spindle rotatably mounted in said supporting frame, a toothed wheelmounted on said second spindle and meshing with said toothed wheel on said first s indle, a manually-operable crank fixed to said second spindle on the side of said supporting frame remote from said toothed wheels, a pillar extending laterally from said supporting frame, a rod pivotally to said extension, a tubular carrier mounted on said rod, a chuck for gripping the object to be pointed removably mounted in said carrier, a spring pivoted to said supporting frame and bearin on the end of the said first spindle on the si e of the supporting frame remote from said abrasive wheel, a rubber disc secured to the face 1% mote from said supporting frame of said toothed wheel on said second spindle and making contact with a disc shaped enlargement of said tubular carrier and a spring pligoted to said extension and bearing on said ro a i In witness whereof I hereunto subscribe my name, this 9th day of October, 1930.

' ALBERT FREDERICK JAMES WRIGHT. 

